Switch remote deploy to vendored source builds

Move remote deployment to a vendored source bundle built on the target host via Docker so redeploys no longer require local cross-compilation or host Go installation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

vendor/github.com/Microsoft/go-winio/.gitignore

@@ -0,0 +1,10 @@
+.vscode/
+
+*.exe
+
+# testing
+testdata
+
+# go workspaces
+go.work
+go.work.sum